It depends on your speaker and amps which will determine whether or not it is worth the expense. Your preamp I gather has only one preamp active output rather than the input you mention. You will first need a Y cable to split the signal to each amp. You then run a pair of cables to each amp. This is if each amp has the same gain. If they do not then you would get an unbalanced sound of top and low end. To balance these levels you will need an active crossover that lets you increase or decrease both or one of the two - like the Bryston 10. You could also use 2 peavey Cozmos units (250) each - this will allow volume adjustments of each amp. After you determine this a pair of speaker cables needs to be run from each amp to the proper terminals on the back of the speaker. You need to remove the jumpers that usually connect the two sets of terminals on each speaker . If the you did not use another device such as the crossover than you are set and are relying on the crossovers built into the speakers. This is also true if you used the Cozmos. If you used the Bryston Crossover you may have to disconnect the built in crossover to get a better situation. Some speakers have a switch on the back for biamping instead of removing jumpers. I like the results I get with my Mcintosh 352 (SS) and 2102 (tubes) amps and the VMPS RM 40's. I use the two Cozmos devices with great success. My preamp - the Mcintosh C42 has mutiple outputs so no Y adapter is needed. If it sounds complicated it can be but breaking it into steps helps - it does tend to get costly.
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